Clinical correlates and heritability of cardiac mechanics: The HyperGEN study

INTERNATIONAL JOURNAL OF CARDIOLOGY

卷:274

Article

Khan, Sadiya S.^1,2  Kim, Kwang-Youn A.²  Peng, Jie²  Aguilar, Frank G.¹  Selvaraj, Senthil¹  Martinez, Eva E.¹  Baldridge, Abigail S.²  Sha, Jin^3,4  Irvin, Marguerite R.^3,4  Broeckel, Ulrich⁵  Arnett, Donna K.^3,4  Rasmussen-Torvik, Laura J.²  Shah, Sanjiv J.¹ 

[1] Northwestern Univ, Feinberg Sch Med, Dept Med, Div Cardiol, Chicago, IL 60611 USA

[2] Northwestern Univ, Feinberg Sch Med, Dept Prevent Med, Chicago, IL 60611 USA

[3] Univ Alabama Birmingham, Sch Publ Hlth, Dept Epidemiol, Birmingham, AL 35294 USA

[4] Univ Alabama Birmingham, Sch Publ Hlth, Dept Biostat, Birmingham, AL 35294 USA

[5] Med Coll Wisconsin, Human & Mol Genet Ctr, Milwaukee, WI 53226 USA

关键词: Cardiac mechanics;    Strain;    Echocardiography;    Heritability;    Genetics;   

DOI  :  10.1016/j.ijcard.2018.07.057

来源: Elsevier

【 摘 要 】

Background: Indices of cardiac mechanics are sensitive markers of subclinical myocardial dysfunction. Improved understanding of the clinical correlates and heritability of cardiac mechanics could result in novel insight into the acquired and genetic risk factors for myocardial dysfunction. Therefore, we sought to determine the clinical correlates and heritability of indices of cardiac mechanics in whites and African Americans (AAs). Methods: We examined 2058 participants stratified by race (1104 whites, 954 AA) in the Hypertension Genetic Epidemiology Network (HyperGEN), a population-and family-based study, and performed digitization of analog echocardiograms with subsequent speckle-tracking analysis. We used linear mixed effects models to determine the clinical correlates of indices of cardiac mechanics (longitudinal, circumferential, radial strain; early diastolic strain rate; and early diastolic tissue velocities). Heritability estimates for cardiac mechanics were calculated using maximum-likelihood variance component analyses in Sequential Oligogenic Linkage Analysis Routine (SOLAR), with adjustment for clinical and echocardiographic covariates. Results: Several clinical characteristics and conventional echocardiographic parameters were found to be associated with speckle-tracking traits of cardiac mechanics. Male sex, blood pressure, and fasting glucose were associated with worse longitudinal strain (LS) (P < 0.05 for all) after multivariable adjustment. After adjustment for covariates, LS, e' velocity, and early diastolic strain rate were found to be heritable; LS and e' velocity had higher heritability estimates in AAs compared to whites. Conclusions: Indices of cardiac mechanics are heritable traits even after adjustment for clinical and conventional echocardiographic correlates. These findings provide the basis for future studies of genetic determinants of these traits that may elucidate race-based differences in heart failure development. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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